Seat for pistons of triple valves



(No Mofiel.) H. PUELLBR.v

SEAT EOE EsiroNs 0E TRIPLE VALVES.

No. 422,392.. 4`Patented Mar. 4, 1890,.

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UNITED STATES PATENT OFFICE.y

HENRY FUELLER, OF ALLEGHENY, PENNSYLVANIA.

SEAT FOR PISTONS OF TRIPLE VALVES.

SPECIFICATION forming part of Letters Patent No. 422,392, dated March 4, 1890.

Application iled October 11, 1889. Serial No. 326,757. (No model.) i

To @ZZ whom it may concern.-

Be it known that I, HENRY FUELLER, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Seats for Pistons of Triple Valves; and I do hereby declare the following to be a full, clear, and eXact de,`-

scription thereof. l

In the operation of the triple valve that is at present used in operating the air-brakes of railway-cars the piston when it is seated upon the packing-ring, as arule, is hard to release and force back on account of the diminished area of airspace, and it is often the case that the force ot' air in the reservoir is not sufficient to release the piston, and in that case the engineer or other person has to do it by force. v

My invention relates to an improvement in piston seats especially adapted to the triple valve used in connection with airbrakes; and it consists of an annular sheetmetal ring or gasket provided With a concentric groove on one side and a corresponding concentric elevation on the opposite side, the

^ same beingperforated for the inlet and outlet of ai'r to and under the piston, whereby an increased area of airspace is formed for forcing back the piston.

To enable others skilled in the art with which my invention is most nearly connected to make and use, I Willproceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification, Figure 1 is a vertical section of the ordinary triple valve Withmy improvement applied thereto. Fig.l 2 is a plan .view of the packingring, showing the perforations for the inlet and outlet of air. Fig. 3 is a vertical transverse sectional view of the annular seat or ring for the piston on the same scale as shown in Fig. 2, the sec- Jion Alieing taken on the dotted line -g/ y of Like numerals of reference denote corresponding parts in all the figures of the drawings.

In order that my invention may be more readily understood by those skilled in the art to Which it relates, I have shown the same in connection with an ordinary.piston-valve of an automatic airbrake.

In Fig. 1 of the drawings, A designates the drain-cup of a reservoir or chamber B, which is located above said cup and communicates with the same through an opening in the diaphragm 10, that separates the reservoir Bfrom the drain-cup A, said openin g being normally closed by a valve 10', which valve is carried by a vertically-movable stem 12, operating in a hollow seat 13, located in .the base of the drain-cup,a coiled retracting-spring 15 being interposed betweensaid valve 10 and theY hollow seat, in which operates the valve-stem 12 C designates the pistonvalve, which is located in the chamber'or reservoir B, and this piston-valve C is carried by a vertical valvestem -5, said stem operating in a vertical chamber 16, formed in the upper part of the valveshell above the chamber or reservoir B. Air is admitted to this chamber 16 by a passage 18, and over the outlet of this passage 18 operates a sliding spring-pressed valve 17, that is located within the vertical chamber 16 and moves or reciprocates With the stem 5 of the piston-valve C, as is obvious.

14 designates the fournvay cock, by which air can be permittedto pass into the passages 18 and 19, the latter passage 19 leading into the drain=cup A, as shown, while the former passage 18 opens into the vertical chamber 16.

It will be understood that no novelty is herein claimed on the ordinary form of the automatic pistonvalve.

I will now proceed to a detailed description of my improvement, which is shown in position Within the reservoir or chamber B in Fig. 1, and is shown separately in Figs. 2 and 3.

and this seat is perforated for the passage of air from the drain-cup A into the reservoir B. On this seat a is placed the piston-seat f of my invention, and this piston-seat comprises an annular sheet-metal packingminghaving a central opening. Vhen this piston-seat is placed in prop'er position in the bott-om of the reservoir or chamber B, or on the seat a at the top of the draincup A, the seat a tits or projects into the central opening in the annular piston-seat f and serves to assist in holding said pistoneseat in place. The sheet metal packing-ring or piston-seat f is struck The drain-cup A is provided with a seat a,

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up to form an annular recess or groove h on the lower side of said seat and a corresponding elevation on the upper side of the seat. This struck-up or elevated portion a; of the annular piston-seat is provided with two series of openings 11 and 12, which openings are arranged in different vertical planes, and constitute, respectively, the air-inlet openings and the air-outlet openings to the annular recess or groove h on the under side of the piston-seat.

The operation is as follows: Air enters from the main pipe through the four-way cock 14 into the drain-cup A, and entering the chainber B it will Iiow down through the opening or perforation 11 into the concentric groove h of the packing-ring f and out through the perforations 12 under the piston-valve C, and through the medium of theA increased air area the rpiston will be easily and rapidly released and forced back.

By the old :method of packing-rings, which are usually made of gum or leather, the pistou when seated has a tendency to stick, on account of a vacuum being formed, and it requires considerable force to release it; but in lny improved packing-ring the piston will seat itself upon the ridged portion of the packing-ring, and the space formed beneath it will easily and rapidly force the piston C back.

The construction of the valve in all its parts is the saine as the ordinary triple valve now in use, except the packing-ring. Therefore I do not claim anything as to the construction 5 of the valve; but

Vhat I do claim is- 1. In a seat for pistons of triple valves, the

co1nbinatio11,with a cylinder or cup having a scat, of an annular piston-seat fitted on the scat of the cylinder, and having the ridge or 4o elevated portion, which forms an annular groove or recess between the seat of the cylinder and the piston-seat, the latter being provided with air inlet and outlet openings, substantially as and for the purpose dcscribed.

2. The combination, With a cylinder having an annular seat surrounding the air-inlet, of a piston-seat iitted on said annular seat, and consisting of an annular sheet-metal ring pro- 5o vided with a concentric groove or recess on its lower side and an elevated or ridged portion on its upper side, the elevated-portion of the piston-seat having the air inlet and outlet openings formed therein, substantially as described.

3. The combination, with a cylinder having an annular seat surrounding the air-inlet, of a piston-seat littcd on said annular seat, and consisting of an annular sheet-metal ring, 6o which is struck up to form a ridged or elcvated portion on its upper side, and a corresponding groove or recess on the lower side, the struck-up portion of the seat being provided with a series of air-inlet and air-outlet openings, substantially as described.

In testimony whereof I have hereunto set my hand this 18th day of September, A. l). 1889.

HENRY FUELLER.

YVitnesses:

A. U. JOHNSTON, C. JorrNs'roN. 

